Absence of one chromosome of a pair is called monosomy for that chromosome.
一对染色体中缺少了一条染色体就称为该染色体的单体。
Next, during anaphase, the two sister chromatids of each chromosome split, and one from each pair is drawn toward each pole of the cell.
在分裂后期, 两个姊妹单体分离, 分别拽向细胞两极。
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